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XML Document Object Model

XML Document Object Model. Anthony Borquez. The Document Object Model. a programming interface for HTML and XML documents. It defines the way a document can be accessed and manipulated. 

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XML Document Object Model

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  1. XML Document Object Model Anthony Borquez

  2. The Document Object Model • a programming interface for HTML and XML documents. It defines the way a document can be accessed and manipulated.  • Using a DOM, a programmer can create a document, navigate its structure, and add, modify, or delete its elements. • The W3C DOM has been designed to be used with any programming language. • provides a standard programming interface that can be used in a wide variety of environments and applications.

  3. The Node Interface • XML parser can be used to load an XML document into the memory of your compute • information can be retrieved and manipulated by accessing the Document Object Model (DOM). • The DOM represents a tree view of the XML document • The documentElement is the top-level of the tree • This element has one or many childNodes that represent the branches of the tree

  4. A Node Interface is used to read and write (or access if you like) the individual elements in the XML node tree • The childNodes property of the documentElement can be accesses with a for/each construct to enumerate each individual node

  5. XML DOM Parser: language-neutral programming model • Supports JavaScript, VBScript, Perl, VB, Java, C++ and more • Supports W3C XML 1.0 and XML DOM • Supports DTD and validation

  6. JavaScript in IE 5.0 var xmlDoc = new ActiveXObject("Microsoft.XMLDOM") VBScript set xmlDoc = CreateObject("Microsoft.XMLDOM") ASP set xmlDoc = Server.CreateObject("Microsoft.XMLDOM")

  7. Loading an XML file into the parser <script language="JavaScript"> var xmlDoc = new ActiveXObject("Microsoft.XMLDOM") xmlDoc.async="false" xmlDoc.load("note.xml") // ....... processing the document goes here </script>

  8. Loading pure XML text into the parser <script language="JavaScript"> var text="<note>“ text=text+"<to>Tove</to><from>Jani</from>“ text=text+"<heading>Reminder</heading>“ text=text+"<body>Don't forget me this weekend!</body>" text=text+"</note>" var xmlDoc = new ActiveXObject("Microsoft.XMLDOM") xmlDoc.async="false" xmlDoc.loadXML(text) // ....... processing the document goes here </script>

  9. The parseError Object var xmlDoc = new ActiveXObject("Microsoft.XMLDOM") xmlDoc.async="false" xmlDoc.load("ksdjf.xml") document.write("<br>Error Code: ") document.write(xmlDoc.parseError.errorCode) document.write("<br>Error Reason: ") document.write(xmlDoc.parseError.reason) document.write("<br>Error Line: ") document.write(xmlDoc.parseError.line)

  10. XML Error var xmlDoc = new ActiveXObject("Microsoft.XMLDOM") xmlDoc.async="false" xmlDoc.load("note_error.xml") document.write("<br>Error Code: ") document.write(xmlDoc.parseError.errorCode) document.write("<br>Error Reason: ") document.write(xmlDoc.parseError.reason) document.write("<br>Error Line: ") document.write(xmlDoc.parseError.line)

  11. The parseError Properties errorCode Returns a long integer error code Reason Returns a string explaining the reason for the error Line Returns a long integer representing the line number for the error linePos Returns a long integer representing the line position for the error srcText Returns a string containing the line that caused the error url Returns the url pointing the loaded document filePos Returns a long integer file position of the error

  12. Traversing the node tree set xmlDoc=CreateObject("Microsoft.XMLDOM") xmlDoc.async="false" xmlDoc.load("note.xml") for each x in xmlDoc.documentElement.childNodes document.write(x.nodename) document.write(": ") document.write(x.text) next

  13. Providing HTML content from XML files • XML can separate HTML documents from their data var xmlDoc = new ActiveXObject("Microsoft.XMLDOM") xmlDoc.async="false" xmlDoc.load("note.xml") nodes = xmlDoc.documentElement.childNodes to.innerText = nodes.item(0).text from.innerText = nodes.item(1).text header.innerText = nodes.item(2).text body.innerText = nodes.item(3).text

  14. Accessing XML elements by name var xmlDoc = new ActiveXObject("Microsoft.XMLDOM") xmlDoc.async="false“ xmlDoc.load("note.xml") document.write(xmlDoc.getElementsByTagName("from").item(0).text)

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